CN1875622A - Color uniformity shading element for cathode ray tube-based image display device - Google Patents
Color uniformity shading element for cathode ray tube-based image display device Download PDFInfo
- Publication number
- CN1875622A CN1875622A CNA2004800323924A CN200480032392A CN1875622A CN 1875622 A CN1875622 A CN 1875622A CN A2004800323924 A CNA2004800323924 A CN A2004800323924A CN 200480032392 A CN200480032392 A CN 200480032392A CN 1875622 A CN1875622 A CN 1875622A
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- lens
- image display
- projection
- shading
- screen
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Projection Apparatus (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
A projecting image display device such as a rear projection type television receiver is provided that includes at least three image projecting sources (10B/G/R) for projecting images in a different color of light and a viewing screen (8) on which the images are projected. The device also includes at least three assemblies (51) each disposed in an optical path between one of the image projecting sources and the viewing screen. Each of the lens assemblies includes a plurality of lens elements (53, 54, 55). A shading element (62), which is affixed to at least one of the lens elements, has a shape and orientation on the lens element that causes an increase in color uniformity across the viewing screen.
Description
Technical field
Relate generally to projection type video display device of the present invention; Relate more specifically to the projection type video display device of the CRT projection TV that is enhanced such as color uniformity.
Background technology
The rear projection type televisions receiver is not owing to can need special installation and/or realize big display screen but not permanent current is capable under big situation of watching the zone.In such receiver, trichromatic cathode tube (red, green and blue) is with on image projection to a mirror, then image is reflected, and to a display screen, wherein this screen can comprise a Fresnel lens that combines with diffuser (and amplification).In the rear projection type televisions receiver, spectators watch picture in a side opposite with the image projection side.
Fig. 1 is the schematic diagram of the conventional optical systems of for example above-mentioned rear projection type televisions receiver of projection image display.As shown in the figure, with respect to screen 8, from left to right in different directions with the cathode ray tube setting of three primary colors.Usually, green cathode ray tube 10G is positioned at the center, and red cathode ray tube 10R and blue cathode-ray pipe 10B lay respectively at its left and right sides, and therefore, the optical axis of different pipes intersects on a point of screen mutually.Angle Θ defines the angle of the optical axis of red and blue cathode-ray pipe with respect to the optical axis formation of the green cathode ray tube that is positioned at the center.Because cathode ray tube is from different direction projections, their Luminance Distribution on screen 8 differ from one another, and therefore, cause being difficult to realize that color is even.For example, when projection white image on whole screen, will produce colour fluctuation, promptly image local redly or band blue.
Fig. 1 also shows lens subassembly 20R, 20G and 20B, and they lay respectively at the front of cathode ray tube 10R, 10G and 10B.The image that lens subassembly produces cathode ray tube focuses on to form a picture on screen 8.
Fig. 2 is the front view (screen side that spectators watch) of screen 8, define a coordinate system on it, thereby initial point is positioned at the 8C of screen center; The positive direction of x axle is extended along the horizontal direction right side; And the positive direction of y axle is extended vertical direction and is extended upward.In addition, in Fig. 1 and 2, H and W represent the width and the height of screen.
Fig. 3 shows the Luminance Distribution of upper edge, the plane horizontal line of screen position 8 through the center of screen 8, and wherein abscissa is represented the horizontal level on the plane, and ordinate is represented relative brightness.At the center of screen position 8C, all brightness of red, green and blue all have been normalized into 1 (expression white).Dotted line is represented red lightness distribution, and dotted line is green lightness distribution, and solid line is blue lightness distribution.Though green Luminance Distribution is symmetrical for the center of screen, red Luminance Distribution is to the skew of the left side of screen, and blue Luminance Distribution is to the skew of the right side of screen position.As can be seen, this side-play amount increases along with the increase of cathode ray tube optical axis offset angle Θ.
As the result of Luminance Distribution among Fig. 3, because in the left side of screen, red relative brightness is higher, and blue relative brightness is lower than green relative brightness, so colour temperature is low and this position of screen presents red partially or inclined to one side Huang.Similarly, because on the right side of screen, red relative brightness is lower, and blue relative brightness is higher than the relative brightness than green, thereby this position of colour temperature height and screen presents inclined to one side indigo plant or green grass or young crops partially.Therefore, spectators will see on screen 8 by the caused colour fluctuation of the geometry arrangement of three cathode ray tubes.In addition, when when reducing distance between lens subassembly 20 and the screen 8 and reduce the size of projection display equipment, these colour fluctuations aggravations.Such size reduces to make that above-mentioned cathode ray tube optical axis offset angle Θ increases, and has caused the corresponding increase of color displacement amount.
At this, mode by reference is with U.S. Patent No. 5,103, and 302 incorporate among the application, and this patent reduces above-mentioned colour fluctuation by providing along the plank of the optical axis setting of each lens subassembly 20.These planks have the hole, and the light that sends from the cathode ray tube related with that plate passes these holes.These holes are axially asymmetric about their optical axis, therefore can be done more evenly from the light of each cathode ray tube along the distribution of screen.That is to say that referring to Fig. 3, the plate hole in the light path of red cathode ray tube is configured to stop the light in more sensing screens left side usually, and the plate hole in the light path of blue cathode-ray pipe is configured to stop the light on more sensing screens right side usually.By utilizing these orifice plates with suitable shape, the colour fluctuation that occurs on the screen can reduce significantly.
Plank relative restrictions many and these enhancing color uniformities of use have appearred.For example, in the making of plank with when installing, permissible error that may restive plank, this may cause image deflects.And plate has increased the quantity of required optics, thereby has increased the expense and the complexity of assembling.
Therefore, be desirable to provide a kind of projection image display optical system that is used for, its adopt can with simpler and more inexpensive manner realize the image source of a plurality of for example cathode ray tubes of color uniformity.
Summary of the invention
According to the present invention, a kind of projection image display is provided, it comprises at least three image projection sources that are used for coming with the light of different colours projected image, and the screen of projected image thereon.This device also comprises at least three lens subassemblies, its each be placed on the light path between one of image projection source and the described screen.Each lens subassembly comprises a plurality of lens elements.A shading element, it is adhered at least one lens element, states shading element and has shape and the orientation that makes color uniformity increase on the screen on the lens element.
According to an aspect of the present invention, shading element is opaque.
According to another aspect of the present invention, shading element is that gray scale is translucent.
According to another aspect of the present invention, shading element is that color is translucent.
According to another aspect of the present invention, shading element is painted on the lens element.
According to another aspect of the present invention, shading element is printed on the lens element.
According to another aspect of the present invention, with adhesive shading element is adhered on the lens element.
According to another aspect of the present invention, each at least three shading elements all is adhered on the lens element in the different lens subassembly.
According to another aspect of the present invention, the image projection source is a cathode ray tube.
According to another aspect of the present invention, cathode ray tube is respectively with red, green and blue optical projection image.
According to another aspect of the present invention, each lens subassembly comprises a plurality of lens elements.
According to another aspect of the present invention, a plurality of lens element comprises an aberration correcting element, a power component and an image field correction mirror element.
According to another aspect of the present invention, shading element is adhered on the aberration correcting element.
According to another aspect of the present invention, lens element comprises an alignment members, is used for aiming at rotatably lens element.
According to another aspect of the present invention, alignment members comprises at least one ledge.
According to another aspect of the present invention, alignment members is to be positioned at lip-deep at least one record mark of lens element.
Description of drawings
Fig. 1 is used for for example schematic diagram of the conventional optical systems of the projection image display of rear projection type televisions receiver.
Fig. 2 is the front view of screen shown in Figure 1.
Fig. 3 shows the Luminance Distribution in the plane of screen position shown in Figure 2.
Fig. 4 is a schematic diagram that adopts exemplary projection image display of the present invention.
Fig. 5 is the cross section of an embodiment that comprises the optical system of cathode ray tube shown in Figure 4 and lens subassembly.
Fig. 6 (a)-6 (e) shows the lens element of having used one or more exemplary shading elements according to the present invention.
Fig. 7 (a)-7 (c) shows lens element correctly is registered near the optical axis of lens element replaceable mechanism.
Embodiment
Fig. 4 is the schematic diagram that can adopt exemplary image display unit of the present invention.Though display unit illustrates with the form of rear projection television receiver, persons of ordinary skill in the art will recognize that the present invention may be used on other projection image displays equally.Cathode ray tube 40 with an image projection by be positioned at the pipe 40 fronts lens subassembly 42.Though for purpose clearly, Fig. 4 only shows single cathode ray tube, one of skill in the art will recognize that three cathode ray tubes of common employing, as shown in Figure 1.What link together with cathode ray tube 40 is base plate (not shown), and this base plate provides operating voltage and video information to cathode ray tube in known manner.The lens subassembly 42 that describes in further detail is hereinafter had a focal length, and this focal length is selected such that images that pipe 40 produces are reflected by mirror 41 and are presented on the screen 43 as an image.
Fig. 5 is the sectional view of an embodiment that comprises the optical system 50 of cathode ray tube 40 shown in Figure 4 and lens subassembly 42.Optical system 50 comprises the cathode ray tube 51 with screen 51a.On the panel of cooling chamber 52 attached to cathode ray tube 51.Cooling chamber 52 has been filled the liquid coolant that is used to cool off cathode ray tube 51.Lens subassembly 57 is configured to receive from light cathode ray tube 51, process cooling chamber 52, and projects image onto on the screen 43 shown in Figure 4.
Lens subassembly 57 comprises three lens units 53,54 and 55.Each lens unit is carried out specific one or more optical functions, and can adopt one or more lens elements.That is to say that term " lens unit " refers to one or more lens elements of the optical function that one or more regulations are provided, perhaps lenticular unit on whole lens design.First lens unit 54 away from cathode ray tube 51 comprises a lenticular element, and this lenticular element provides lens all or all basically positive light cokes.Second lens unit 53 has at least one aspheric surface as aberration corrector.The 3rd lens unit 55 near cathode ray tube 51 has a concave surface, this concave surface is towards second lens unit 54 and as an image field correction mirror, and the Petzval curvature of field (Petzva1 curvature) that comes down to first and/or second lens unit is proofreaded.
According to the present invention, U.S. Patent No. 5,103, the plank that adopts in 302 is replaced by one or more shading elements, and these shading elements are applied directly to the one or more lens elements in the lens subassembly 57.Can shading element be applied to lens element by any suitable mode.For example, shading element can be coated with, print or utilize adhesive to adhere on the lens element.Though, shading element can be applied on any independent lens in the lens subassembly 57, but with they be applied to a lens element in the 3rd lens unit 55 get on preferred often because will before 54 pairs of images of second lens element amplify, finish shading by this method.
Fig. 6 (a)-6 (e) shows a lens element 60, has used one or more exemplary shading elements 62 on it.Substitute the plank of discussing in the above-mentioned patent with shading element 62 and increased a large amount of benefits.At first, the permissible error of shading element can be controlled better than the permissible error of plank, has therefore reduced defective.Secondly because shading element 62 combines with lens element 60, so the quantity of required optics reduce, thereby reduced expense and made assembling simple.The 3rd, can easily adopt the value volume and range of product of the different shading element of shading 62, and these value volume and range of product are than adopting many that plank obtained.This allows to use the shading pattern of customization, because can adopt different shading elements, the shading pattern of customization can obtain the optimal colors uniformity better, this only influence screen a position (for example center) color uniformity and do not influence the color uniformity of another position of screen (being the angle).
Another important advantage of the present invention is: shading element needn't be opaque.But shading element can have various gray scales or color translucence.This provides another kind of mode, can change the color density on the screen in this way.In addition, owing to only stopped the part spectrum of realizing the light that color uniformity is required, so compare with opaque shading element, this mode is lighter to the injury of entire image brightness.
Because shading element is applied directly to lens element, therefore often need lens element correctly is registered near the optical axis of lens element.Such aligning can be realized with various distinct methods.For example, shown in Fig. 7 (a), can be on lens flange one or more ledges 70 of mold formation and the engagement of lens subassembly fixture.Alternatively, shown in Fig. 7 (b), can add record mark 72 on lens element, it can directly form in lens when lens form or after forming.In another alternate embodiment shown in Fig. 7 (c), can on lens element, form one or more ledges 74 by injection molding.
Claims (20)
1, a kind of projection image display comprises:
At least three image projection sources that are used for coming projected image with the light of different colours;
The screen of projected image thereon;
At least three lens subassemblies, its each be placed in the light path between in the image projection source one and the described screen, each described lens subassembly comprises a plurality of lens elements; And
A shading element, it is adhered at least one lens element, and wherein said shading element has shape and the orientation that makes color uniformity increase on the screen on the lens element.
2, projection image display as claimed in claim 1, wherein said shading element is opaque.
3, projection image display as claimed in claim 1, wherein said shading element are that gray scale is translucent.
4, projection image display as claimed in claim 1, wherein said shading element are that color is translucent.
5, projection image display as claimed in claim 1, wherein said shading element is painted on the lens element.
6, projection image display as claimed in claim 1, wherein said shading element is printed on the lens element.
7, projection image display as claimed in claim 1 further comprises adhesive, is used for described shading element is adhered to lens element.
8, projection image display as claimed in claim 1 further comprises at least three shading elements, and each shading element is adhered on the lens element in the different lens subassembly.
9, projection image display as claimed in claim 1, wherein said image projection source is a cathode ray tube.
10, projection image display as claimed in claim 9, wherein said cathode ray tube are respectively with red, green and blue coloured light projected image.
11, projection image display as claimed in claim 1, wherein said each lens subassembly comprises a plurality of lens elements.
12, projection image display as claimed in claim 11, wherein said a plurality of lens elements comprise an aberration correcting element, a power component and an image field correction mirror element.
13, projection image display as claimed in claim 12, wherein said shading element is adhered on the aberration correcting element.
14, projection image display as claimed in claim 1, wherein said lens element comprise an alignment members, are used for aiming at rotatably lens element.
15, projection image display as claimed in claim 14, wherein said alignment members comprises at least one ledge.
16, projection image display as claimed in claim 14, wherein said alignment members are to be positioned at lip-deep at least one record mark of lens element.
17, a kind of on the screen of image display device the method for display image, described method comprises the steps:
Light with at least three kinds of colors produces an image; And
With in the light of three kinds of colors each with this image projection to screen with a lens subassembly, this lens subassembly has the shading element that adheres on it, this shading element increases the color uniformity on the screen.
18, method as claimed in claim 17, wherein said shading element comprise a translucent component.
19, a kind of method that is formed for the lens subassembly of image display device comprises:
At least one lens element is provided, is used for receiving with monochromatic image from cathode ray tube, and with described image projection to the screen of described image display device; And
Described at least one lens element is posted on the shading element, the monochromatic uniformity on the screen is increased.
20, method as claimed in claim 19, wherein said adhering step comprise shading element are coated onto step on the lens element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/699,046 | 2003-10-31 | ||
| US10/699,046 US20050094037A1 (en) | 2003-10-31 | 2003-10-31 | Color uniformity shading element for cathode ray tube-based image display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1875622A true CN1875622A (en) | 2006-12-06 |
Family
ID=34550838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004800323924A Pending CN1875622A (en) | 2003-10-31 | 2004-10-29 | Color uniformity shading element for cathode ray tube-based image display device |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20050094037A1 (en) |
| KR (1) | KR20060129204A (en) |
| CN (1) | CN1875622A (en) |
| BR (1) | BRPI0416089A (en) |
| MX (1) | MXPA06004733A (en) |
| WO (1) | WO2005043883A2 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4682862A (en) * | 1986-01-17 | 1987-07-28 | U.S. Precision Lens Incorporated | Projection lens |
| US5103302A (en) * | 1989-01-20 | 1992-04-07 | Hitachi, Ltd. | Optical system for projection type image display device |
| JPH0744688B2 (en) * | 1989-06-08 | 1995-05-15 | 三菱電機株式会社 | Projection-type television system |
| JPH03198492A (en) * | 1989-12-26 | 1991-08-29 | Mitsubishi Electric Corp | Projector type television unit |
| JPH05341167A (en) * | 1992-06-08 | 1993-12-24 | Matsushita Electric Ind Co Ltd | Lens holding member and formation of thin film |
| US6531230B1 (en) * | 1998-01-13 | 2003-03-11 | 3M Innovative Properties Company | Color shifting film |
| KR100803586B1 (en) * | 2001-12-18 | 2008-02-15 | 삼성전자주식회사 | Contrast improving apparatus for a projection television |
-
2003
- 2003-10-31 US US10/699,046 patent/US20050094037A1/en not_active Abandoned
-
2004
- 2004-10-29 WO PCT/US2004/036315 patent/WO2005043883A2/en active Application Filing
- 2004-10-29 BR BRPI0416089-4A patent/BRPI0416089A/en not_active Application Discontinuation
- 2004-10-29 KR KR1020067010539A patent/KR20060129204A/en not_active Application Discontinuation
- 2004-10-29 CN CNA2004800323924A patent/CN1875622A/en active Pending
- 2004-10-29 MX MXPA06004733A patent/MXPA06004733A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| KR20060129204A (en) | 2006-12-15 |
| WO2005043883A2 (en) | 2005-05-12 |
| US20050094037A1 (en) | 2005-05-05 |
| BRPI0416089A (en) | 2007-01-02 |
| WO2005043883A3 (en) | 2005-06-30 |
| MXPA06004733A (en) | 2006-12-14 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |